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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eaad93dcc08504f1c6b6b763d46c761e7b0b2443d8e78b5e362887dbe984b1d4' 
  AND token = 'xqsxrmg1oizcy4nQLZPzM4Kr04EGcMyH2HylGwNHS5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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