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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2252576d58fa59c8570a13f87494ad011d127852262bd8ceb170ab1e8441c069' 
  AND token = '8wb2vhKeQYu5XJwh0TbjsR7jRAxdWDfQFD6DsySWCrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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