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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fcaef24624272cf9073be0fa15fbb6618104efe23b45e6a7f24dc825e6af355b' 
  AND token = '8RmBOxxfj958A7MB4xRRusnBpggIvHJ1ol1oPxPCkJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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