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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ed2fdd80702b95c7ccc1f4acf93e1b57eb991920d4fa0efc83d5327188161a9b' 
  AND token = 'HSQTfZYr6hS21cwxf7Q+TutKkbjQbYV5aZ4m6tui8As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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