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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5adf9b72923b0d840cfa399ae0919f9d4a9413dc9f678c78cfc3c4e40a45d276' 
  AND token = 'xpI8wTx6fRiOrDgQNx+THIsO1sayI5O7x62diqeuSG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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