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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ba9ba3560842a9c5dd61bdb16363ee4f13f1e42a07d6934ff98a5671571974a6' 
  AND token = 'uaD22rKnQi0hLQKfxh/6sZujaDxforlATnMphZyasKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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