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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b9a7423de6e7a15e41ae8a24b53cc6046ae494b857c13351c6ff741fd3abfa68' 
  AND token = '442nVgEE4SiEY7EUd/cZ7unflDP3s5KACGFhlJaTqYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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