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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '03e7f5e41ee6287a9b9c990e673a047d2a2a66774111e8b28e275bede0b2bbe9' 
  AND token = '6baByAQcyNZz2b7HBPyR43whuN0ONwACF5+fjw/QrEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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