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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cbc7c7540ae060b871140a9167dec2f87b2dddf0a4f3e90ea2b6c547c4cc1cf6' 
  AND token = 'FRwKls9NLWcvkiS88SWrUyUY555fGbr0iRycfoyAXB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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