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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3868fb0970a6be570bba997353db5797dc89af7c2ddbc2cce32db5b34d8d4711' 
  AND token = 'myYPYagoL+GXzDbsDF6bkpH3uDq+i8MsQ8Y0PG5yx9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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