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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ef87a366d5fb21231d2db3b589b9dd47d45a779a47a9429be3dd9bf17001c720' 
  AND token = 'WyAJts7Oz7onKXRlU3bMOqRyFRia7syiq7FeCKMlgfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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