Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea8cc60a3b0e1ce79e0bf480a3218a506dc33cc0580b16932ccad1fbf9f9b3eb' 
  AND token = 'zKI4G1fQwakLV5CLZNaEVoBxbbsp8W//LBDTJB7twoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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