Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70f08aab2070bc8b4c4982066735695a8edbd28140e618b2335fc9319457511' 
  AND token = 'InmlzWkx7ACi54R+rA6ej8pMvBj0PUGMCzViVCrff7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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