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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6e93b125ded0551906db085a428c868888e17df1ff053b377307285a6d50d1f2' 
  AND token = 'aBPVE5xsx8vW6vgBy0ipgMSg3AlX8vJja0fiJXGKdDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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