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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3a13732b59a1119c5a1da5d8c14d38abefd86fdd71eb805a425fc9fe353ec33b' 
  AND token = 'zgtNoaZSWco8XUoffUozbhyLYPv9oVUPfIYW9I2vcLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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