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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e2cd0e2658fd5759a0e596367f749ca42d1f4d758b5cc469328f55d80ccd1fd0' 
  AND token = 'Mk77FeEBBlIHaKgmoteszN2qudwK4SLb/A3ldS5oadU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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