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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '60a555d8167d24f48386591b848a10d048d53d5ed912c4ddc3f698d274a90c37' 
  AND token = 'dPxU73lKcyu03AWRPgzlV4R2k8uru/bcqkzJYM5MD7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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