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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8fb62fe4f783c09eb3ef12365b42d1a9fb40e729e017e6956010010e25af9582' 
  AND token = '/lTQPFGHDLrhFHx/e5QiOWMMlQieJyL5mkjdpJ7OBSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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