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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1c9dde6076912b510d0ef929a27c46aeed867669e76eca6f4e38be86ac27618d' 
  AND token = '3OkyjzvT5MgtySoQMqigltJPmt3meRzo65cLUzEbskE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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