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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'de1b0aa35f7762c40ec6c3a2c6458f584bd3f2cd6475c61ac1e46de8cabde528' 
  AND token = 'l5OzKs23R7iAtNvEJlb4CK27XFTER0uOzZb71IAlDXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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