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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '157cd98f3e274dc115d737fe70f7035c371b86e776fcd88db660437cd161e07b' 
  AND token = 'Tl8fMzoZ69b1DwUiGC8KeairTjUg55rhFAqbsu88iEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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