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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '475ccfc97ffdf2a94b231b3d80565f24499bcd3c314367a71558ffd93b0cca11' 
  AND token = 'N3yjdEa11Mz3C3GPca5yGa8GB8Ynju0AV2W27U2zXcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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