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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'eed25ec65590c214c6f0b28ea0067ab6d2cf85e3220f6aa045969b6bdaed920b' 
  AND token = 'MiFXGi5oYWlLzmvOk5DC83TxVNF0/HQFQ9UqUFSbCnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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