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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e8d5e6feb0680c0996a1702b2a943d7aa213da1767bf67eb36740bc64afb59da' 
  AND token = 'MIFKTSqWj6zyS6Z6Aboe2UI6/dExTwoK7BWmD/JgUwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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