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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '100ec9107e9ab87d9009d8165d25a58f89e9af34ed86a223dc3ca438040468d4' 
  AND token = 'yRgk+GCjOEQIoQ7IN+79xDf9yv5Rmpm7MOSxrwYUrjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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