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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '069d2dd63c0de2828e13cec864366f41a19fc31420caee913238f1f637245993' 
  AND token = 'iuHIm4ivwZBUFm3qqaVDHoPO1CrL8M37NVL3WOOmd7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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