Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c78a7f80c05f4649ae0640d264940878f0e9095e52ddd65605e86683104df7a5' 
  AND token = 'eAmQ9EaQERT/tGiHjCi4VMuUSQx/bP2PKKyoMEW+W+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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