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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a9ed2ba4c7f295039ecec43e72abd56f436746204dda8757b3f429ca1f72ded2' 
  AND token = 'IInZ6Fy8ar7SUUCItGkfFZ5DnU2GbvMHwIQCzwaxbRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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