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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd7cd4212651e150f4dd9f1ea9918b11bff0634549bc7edddded8c2e95a9ccc0c' 
  AND token = 'eiFAAC8Z7WMWCyHPoX4FRhb5QSeMfDUTpJqBHCtM9Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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