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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '047496783284dec15db2cb111bb2e800f3637e43ef0854565ba06916a9285cbf' 
  AND token = 'M7HAIBa7XuEud1szuR9cvnNwMdwBGC1HvkzD20MzNUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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