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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fe05c48368b7102695885c107053c5490ef5b5946b1070bd08240ebe15aad1bf' 
  AND token = 'E/bA0gZRogB7aNQesosEU8Pmg8dW/FzDq3otDal2NEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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