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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '24ae3abb87f636c571876177a6ec72692e083e95f14c3e357961237fc9a91451' 
  AND token = 'giJpypLc0GzrR3B8MGse5IdquTBp0eqw5HwPpXD/Tbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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