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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '86ac214a1fcc63aa1423e55c365d6e970d23aa8c1c8ecec4ca1b3d98caa1845c' 
  AND token = 'b23aICy1cp1sk+ekrmb7Fie8dVTNJdAkM3hDJFIJ458=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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