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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '781f1609da4f47b8d47f7d1e6f1090f44cde80821c322dca149eebe0fedb21ac' 
  AND token = 'suK9rKA62nA4IEH0LJsFwXdEGsITTz8SFrWNCAw1GoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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