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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '73a0adb5cc55a14a7a76fcc506062e8f01cba164cbc9313b5bf90559b68f93f9' 
  AND token = '1xqUAFpNIRO6MVPMw4tO4aWKXS1rTelslCWa8YxHEc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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