Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b7bad71c3b0ecb1f21dae04b40c967ab19ecd456c2e9bb41fb30e57a1aefa8' 
  AND token = '2/pI+DFDaZslpxf+0CodJ3tCBcKxpNPSM9dUCqrJvUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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