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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '43f66ce61c290b47db451541d5ce67a285d0568cafebc00c5b23d2383d368a28' 
  AND token = 'Ez2TmXpL0bvwFRImqU8cq2nT1QGp5g+bsQkN5MJcB80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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