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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '15043cb07cef41d6a5f32ac5ee7b0bd47ce9527ad0d5580e244e5b8945b17d94' 
  AND token = 'Cp38hm476ALeSHahFCun7clzm0JJ2vEkQY9SzEH4d08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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