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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1518fe06191e156cf81fe2be7dd6457c5b7345c8eee8e516289477a3e71e9688' 
  AND token = 'DB7Iv8kEud4iq2knzq8+Pd5xpQQhD6J3F7pndwtDHBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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