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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c5c3341bf0918c924c92c1c32b5a3c50eb3b2b3abc91eb1a4e0dd8277596d91d' 
  AND token = 'N1TRIcQm1pe1U4Zad457KOhmvNgcrEpbkiqa4iRzXg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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