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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7b739cc30a0841ff9599e60bea9cec5d5c5cf5122be2822fd453a4e8edd03f58' 
  AND token = 'O2gABOcsk6PTvB1LA8mv/aZgbVMp+ceifIDxEu2Cqjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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