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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bc7b814298250ef7b189296b29d306d28dd5f1663905708f4b692c9f3ce4c47b' 
  AND token = '9lFH2RUm923EFVyihMRmwi7nsOej8LZXRKKbfcJAmLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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