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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b6d0ca2f8cbff9f9eeb92e0096779973fc10cdacf9dd4b748b3de619c415ab64' 
  AND token = 'fnNNtNwSZDc6DC4kkMkgbgysfvE5z3YiMKaelkBHM+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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