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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ea19200cd5eaf131af01781a6cee2e1cfffc536dd9a4192319601a7bb4889e4f' 
  AND token = 'rxbWsOy7xykxZg1WNz9XZaWOPmmnqjPoL3s7B/cD3Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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