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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '34ae32c1c99fa9d3f719cf12e333c99aff6adbd35a291fedc8b4024ad3a259b9' 
  AND token = 'GHjrTgAEzYWrlglN0Fmw4vcBIOx5TAE6jrxrwHhTjGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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