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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7b20a19282fb15a45aaee162d886f87104465e0086333ff69faf0d3c4a48fa05' 
  AND token = '6IM0FHqPlE1pB84Hu1ocUvezZ6C0z26500buPPZ5HZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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