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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'df30a998b8503ed85c5e32889170e04fbb7cc52a3adb112db7be7661ad8f15dc' 
  AND token = 'LO1nCCXxll0hhWi5hbZdpJj5HiDLb3cJlCI2u/NUr04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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