Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e49ad60a86e0c6363adb3945841ca3a0badf2fc0c3d8f3a91ec0c64db9ca5388' 
  AND token = 'Rum7cBnp8Fc+PjzM7okEYEf/is+gfxVecbaQlVILqm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}