Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd65a1f6f41dac3feec4a1f0034cb32a21c2da4fdf3c6f91a3282a0cda14c921' 
  AND token = 'jYCmmg8Xt71fvhDGfyRNIqcYHvA/qlgu1YHfdjUvCnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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