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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b026e92f2b4e9709df6fa341f6bc858ce691aa87fa8a77efc928a69d620d92d4' 
  AND token = '40rLoQyQdH0fZEFalWoNUFLQLHYBXmsOLHfjjkLe1ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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