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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dbc92712eadc51a72f05938708e9d7f585f5288e92552bed1cd9e4202b88a51a' 
  AND token = '8zKodMC1dXceEx96aYvEyBYxpjphwkQv7czc2VJH89U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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