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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '56d9fa9df6e331159f32d0e7013d6b5ea483d0fe2d9eb74af5f910fa7d6af7bf' 
  AND token = 'vbC6z56i6Sma/e7Sy2J3UFoEOZHd0RJaHqaB1Q/X2x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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