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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '852a0d311abf219160267c7a0b1dd76afbd961b8c83e73ec937005fe49e4958d' 
  AND token = 'dHn095SHPZE6P4n3YfZ6nvlo1qnluX1/JY04PO2d+AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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