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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1315ea10418075b23b8ffd49a24ad5839af27c4ea85a021a0b909f71daca4620' 
  AND token = 'tGaNeBgdtBfOlqmUl3kc1jrsSfE/2q8orrFPltjuHEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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