Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50852a2b2c2561565c8f2ec21420ff84d841c7639426eb403b4dc7570286748a' 
  AND token = '+ztoAFcv0zieHGMN2ApqFiJfqBHLpuC4DV2gC5qusyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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