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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd22803679b73aca2ea3533a931352138a0ec96f058965ab1f98468a6a4458bc8' 
  AND token = '9wtjcVhcaA0LqVTtV9SKMrfnjaHYNUpoTz7I5lcusYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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