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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2c62b22002f15451e7b48a60fce48acb7222b8d7a9d5770e6561111246c15a27' 
  AND token = 'Uur0wbwgUXcWnNIPcPnufGwJLSjZ6zAkpHLNtqOd+us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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