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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7583d11aaf40b8d94f9a39249cb38cfb357f1c9c2363c108a8b90d44935c490e' 
  AND token = 'C3OAcobr3ebkdQu29thHol4tPbt6mr4gSmcPmSL7fCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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