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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b4155a2cbe9cd55f2c0037c103de52516577485b8669fdd44e556036a4a5e5a1' 
  AND token = 'IQwSVZH8mia9f5zx6+txOjtQuX2AL80vw7eke2b/xes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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