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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '691f43df37b5faca55d71a4905f3b0f0242cba11560e7dc6aca78b78710dd121' 
  AND token = 'sPzcmfeXGabgdJ2t/xJnDWxnJ9xIc6IeQlp97BcJxyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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