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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '22a9b0dad062e7abbdb0ad3e434a4ad908b079a2b81c335601a53fe3ecc8ef51' 
  AND token = 'KbenakglRFlhyURiqeoZf2h0VVL4w6rt2e0aeC+t9FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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