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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2a70ce40af2d71354fa0cc47801efe2c84cb5eaa78b4bb6e9815e604306f2633' 
  AND token = '6WUzpFkLB3HgH/q/3PIcfVMNkf7IXQzy8y+FKtb0YcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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