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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5ae268dbe1fa3ea525df8d1ee433baa9895510f5d6b398648ee7cbbf78d986af' 
  AND token = '5Yqof1aeZm2F1VMQRM9MAsuXSqYWiSLnQrZhPY6ilB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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