Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed6aa9b8dbd2a9e0e6bc61e12980dddb2fda90a924fec747a8c76682d35bade8' 
  AND token = 'Uv0l21ANT32+IRkyGN1iVJIJ6dmrL2UfS/kM2RLWleE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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