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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '32fbcd56451163b0cc60874c9e49aee699fdb2f9644c2361a34ca5d820e80e64' 
  AND token = 'ruAu4g5gMAZgY9rTv4MPGpaGJ4FvtpvcKUubf2vQIxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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