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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '82d8f0ccb47fb609ec170eb1b38161c776f972a6d5bab898b1f5d3b5ab611b95' 
  AND token = 'eWKfMyAj5yp5fb8xKNhNC8/NsH65klj0qVgDPJz1QY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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