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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a3019b30542d61d865ada524bd45c6a84dda846d784779a8a206f1c4f1f0a4b4' 
  AND token = 'RD+ui+JbjRbrHUuIS4Ir51jzKIDeGycwR1otGXj1Sfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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