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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd05f06befdee76e5c6078ec6146e20cd65011fd7f0eee2c2c94f9c1ffd255b87' 
  AND token = 'oPrb6CMGSwwgz/JOMwP0AbiyIthnQokmwvUqz4IhpvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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