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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5bf73d78e9fc1e8737093474b67ae6dfa364dd888dd0efdc80e73d6c00fab862' 
  AND token = 'qenoFI5KG8nsFjmOlVdDhUEt71/6KR6IECBqPRFwl74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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