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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '69ea7c924729bc182a49eabf9ee22ca9b0a48578490ffe809c64cd51a5b13f1c' 
  AND token = '6ECCN6HOyDsSGYLD+KU5cZMAoZ15sYObg7q8Da6WZDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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