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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0a8dcaf4f10764ae9acc00ff9cf3cfa1f83f96e9cdb44017996f54ca510a241a' 
  AND token = 'Li9evdQrkw/YttBe7jnj+BSMWPknWS1LaRBYZot26FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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